Preheat the oven to 190C/180C Fan/Gas 5 and line a 12-hole muffin tin with paper cases.
Sift the flour, sugar, bicarbonate of soda and salt into a large bowl and mix to combine.
Whisk the milk, soured cream, eggs, sunflower oil and vanilla together in a jug or bowl until well combined.
Pour the milk and egg mixture into the dry ingredients and mix, using a large metal spoon or spatula, until just combined. Add the frozen raspberries and chocolate chips and mix until only just combined – do not over-mix or the raspberries will break up.
Spoon the mixture into the paper cases. Bake for about 25 minutes, or until the muffins are well risen and golden brown.
Transfer to a wire rack to cool. Best eaten on the day of making.
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